Perhaps you should try some spelling variations:
quang thanh » quan thanh, hoang thanh, muong thanh
chieu sach » chinh sach, chiet tach, chieu xanh
chieu sang » chieu xanh, nhieu tang
thanh tung » thanh cong
hieu lang » hieu quang, nhieu tang, hieu van
tung cong » dung cong, tong cong, truong cong
cong tac » cong ty
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((chieu sach) or (((chieu sang) OR (hieu lang)))) - nhanh quang thanh tung cong tac toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((chieu sach) OR (((chieu sang) OR (hieu lang)))) - nhanh quang thanh tung cong tac toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doi ((chieu sach) or (((chieu sang) OR (hieu lang)))) - nhanh quang thanh tung cong tac toan cau".
• Adding a wildcard symbol may retrieve word variants: doi ((chieu sach) or (((chieu sang) OR (hieu lang)))) - nhanh quang thanh tung cong tac toan cau*.